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Finding the Fourth Proportional to 402.28, 555.80 and 303.86

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Solution

The fourth proportional to 402.28, 555.80 and 303.86 is: 419.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.28 : 555.80 = 303.86 : x
  2. Step 2: Convert to fraction form
    402.28/555.80 = 303.86/x
  3. Step 3: Cross multiply
    402.28x = 555.80 × 303.86
  4. Step 4: Simplify right side
    402.28x = 168,883.87
  5. Step 5: Solve for x
    x = 168,883.87/402.28
  6. Step 6: Final answer
    x = 419.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.